Configuring snmp trap, Enabling the trap function – H3C Technologies H3C S5120 Series Switches User Manual

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A large number of logs occupy storage space of the device, thus affecting the performance of the

device. Therefore, it is recommended to disable SNMP logging.

The size of SNMP logs cannot exceed that allowed by the information center, and the total length of

the node field and value field of each log record cannot exceed 1K bytes; otherwise, the exceeding

part will not be displayed.

For the detailed description of system information, the information center and the info-center

source command, refer to Information Center Configuration.

Configuring SNMP Trap

Enabling the Trap Function

The SNMP agent sends traps to the NMS to inform the NMS of critical and important events (such as

reboot of a managed device). Two types of traps are available: generic traps and vendor-specific traps.

Generic traps supported on the device include: authentication, coldstart, linkdown, linkup and

warmstart. The others are self-defined traps, which are generated by different modules. As traps that

occupy large device memory affect device performance, it is recommended not to enable the trap

function for all modules but for the specific modules as needed.

With the trap function enabled on a module, the traps generated by the module will be sent to the

information center. The information center has seven information output destinations. By default, traps

of all modules are allowed to be output to the console, monitor terminal (monitor), loghost, and logfile;

traps of all modules and with level equal to or higher than warnings are allowed to be output to the

trapbuffer and SNMP module (snmpagent); and traps cannot be sent to the logbuffer. You can set

parameters for the information center based on the levels of the traps generated by each module, and

thus decide the output rules of traps (that is, whether traps are allowed to be output and the output

destinations). For the configuration of the information center, refer to Information Center Configuration.

Follow these steps to enable the trap function:

To do…

Use the command…

Remarks

Enter system view

system-view

—

Enable the trap function
globally

Optional

By default, the trap function is
enabled.

Enter interface view

interface interface-type
interface-number

—

Enable the trap function of
interface state changes

enable snmp trap updown

Optional

Enabled by default.